Overview
The LM74800QDRRRQ1, produced by Texas Instruments, is an ideal diode controller designed for automotive applications. This device is part of the LM7480x-Q1 family, which includes the LM74800-Q1 and LM74801-Q1 variants. It is AEC-Q100 qualified, ensuring it meets stringent automotive standards. The LM74800QDRRRQ1 operates over a wide input voltage range of 3 V to 65 V, making it suitable for protecting and controlling 12-V and 24-V automotive battery-powered Electronic Control Units (ECUs). It features reverse input protection down to –65 V and drives external back-to-back N-Channel MOSFETs in common drain and common source configurations to emulate an ideal diode rectifier with power path ON/OFF control and overvoltage protection.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3 | 65 | V | |
| Ambient Operating Temperature Range | –40 | 125 | °C | |
| Reverse Input Protection | –65 | V | ||
| Forward Voltage Drop Regulation (LM74800-Q1) | 6.8 | 10.5 | 13.4 | mV |
| Reverse Detection Threshold | –6.4 | –4.5 | –1.3 | mV |
| Peak Gate (DGATE) Turnon Current | 20 | mA | ||
| Peak DGATE Turnoff Current | 2.6 | A | ||
| Shutdown Current (EN/UVLO=Low) | 2.87 | µA | ||
| Package Type | 12-Pin WSON |
Key Features
- AEC-Q100 qualified for automotive applications with a device temperature grade 1: –40°C to +125°C ambient operating temperature range.
- Device HBM ESD classification level 2 and CDM ESD classification level C4B.
- Wide input voltage range of 3 V to 65 V.
- Reverse input protection down to –65 V.
- Drives external back-to-back N-Channel MOSFETs in common drain and common source configurations.
- Ideal diode operation with 10.5-mV A to C forward voltage drop regulation (LM74800-Q1).
- Low reverse detection threshold (–4.5 mV) with fast response (0.5 µs).
- Adjustable overvoltage protection.
- Meets automotive ISO7637 transient requirements with a suitable TVS diode.
- Low 2.87-µA shutdown current (EN/UVLO=Low).
Applications
- Automotive battery protection.
- Advanced Driver Assistance Systems (ADAS) domain controllers.
- Camera Electronic Control Units (ECUs).
- Head Units.
- USB HUBs.
- Active ORing for redundant power systems.
Q & A
- What is the operating temperature range of the LM74800QDRRRQ1?
The device operates over an ambient temperature range of –40°C to +125°C.
- What is the input voltage range of the LM74800QDRRRQ1?
The input voltage range is from 3 V to 65 V.
- What type of protection does the LM74800QDRRRQ1 offer against negative supply voltages?
The device offers reverse input protection down to –65 V.
- How does the LM74800QDRRRQ1 emulate an ideal diode?
It drives external back-to-back N-Channel MOSFETs in common drain and common source configurations to emulate an ideal diode rectifier.
- What is the forward voltage drop regulation for the LM74800-Q1 variant?
The forward voltage drop regulation is 10.5 mV.
- What is the peak gate (DGATE) turnon current?
The peak gate (DGATE) turnon current is 20 mA.
- Does the LM74800QDRRRQ1 meet automotive transient requirements?
Yes, it meets automotive ISO7637 transient requirements with a suitable TVS diode.
- What is the shutdown current when EN/UVLO is low?
The shutdown current is 2.87 µA when EN/UVLO is low.
- In what package type is the LM74800QDRRRQ1 available?
The device is available in a 12-Pin WSON package.
- What are some typical applications of the LM74800QDRRRQ1?
Typical applications include automotive battery protection, ADAS domain controllers, camera ECUs, head units, USB HUBs, and active ORing for redundant power systems.
